RedEaredSlider writes: Thirty thousand years ago, the human family was pretty crowded.

A finger bone fond in a cave in Siberia appears to have come from a previously unknown variety of human. If confirmed, it could rewrite much of what we know about the history of modern humans — and our relatives.

The bone is from a young girl, and dates to 30,000-50,000 years ago. It was found with a tooth. Scientists have now extracted the DNA from both and sequenced the genome. They found it doesn't match modern humans, nor does it match Neanderthals. That means there was someone else roaming the steppe of eastern Asia.